TMDLs in Virginia

When state waters are assessed to be impaired for one or more reasons, Total Maximum Daily Loads (TMDLs) or TMDL alternatives are developed by DEQ to determine the total amount of a pollutant that a waterbody can handle without resulting in the impaired status of that waterbody. These impaired waters are outlined in the biennial Virginia Water Quality Assessment 305(b)/303(d) Integrated Report, which can be found on the Water Quality Assessments page.

During the development of TMDLs, TMDL alternatives, and TMDL Implementation Plans (IPs), public input is requested at the onset of the development process and when a draft TMDL, TMDL alternative, or TMDL IP report is available for review. To participate in the development of TMDLs, TMDL alternatives, and TMDL IPs visit DEQ’s TMDL Public Notices webpage, or visit the Virginia Regulatory Town Hall and look for meetings filtered by the Agency of the “Department of Environmental Quality” and the Regulatory Board of the “State Water Control Board.” 

To see an interactive map of the currently approved TMDLs, visit the Virginia Environmental Geographic Information System (VEGIS) mapper application. You can also download the TMDL and TMDL Implementation Plan related spatial datasets on the VEGIS Datasets webpage. To review any draft TMDLs or view any approved TMDLs, visit the draft TMDLs or approved TMDLs webpages.

For more information on TMDLs in Virginia, contact Mark Richards.

TMDL Development Process: Starts with water quality monitoring, that data is then assessed to identify what waters are impaired, when waters are identified as impaired then it moves to TMDL development. In TMDL development the acceptable point source and nonpoint source loads are established, and then it moves into the implementation process where TMDL implementation plans are developed.

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Virginia Department of
Environmental Quality
P.O. Box 1105
Richmond, VA 23218
(804) 698-4000

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